DTC Troubleshooting: B1779
DTC B1779:
 HFT-Voice Control Switch (HFT TALK/HFL BACK Buttons) Circuit Open/Short to Power
  1. Connect the HDS to the DLC.
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch to LOCK (0), then start the vehicle and turn the steering wheel back and forth several times.
  1. Check for DTCs with the HDS.
Is DTC B1779 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time.■
  1. Turn the ignition switch to LOCK (0).
  1. Do the HFT-voice control switch test.
Is the switch OK?
YES -
Go to Step 7 .
NO -
Replace the HFT-voice control switch. ■
  1. Remove the driver's dashboard lower cover.
  1. Disconnect Hands Free Telephone control unit 28P connector.
  1. Disconnect HFT-voice control switch 5P connector.
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage of the HFL-Voice Control switch connector (5P) terminal No. 3 to body ground.
Is there voltage?
YES -
Repair a short to power on GRY wire.■
NO -
Go to Step 12 .